A. Some states do not tax income at all. Which of the following statement(s) about state income taxes is most correct?

A. Some states do not tax income at all. Which of the following statement(s) about state income taxes is most correct? A. Some states do not tax income at all. B. If states tax income, they must follow federal guidelines for designing the tax structure. C. States are not allowed to use an increasing marginal tax rate structure in the design of their income tax system. D. All of the statements above are true.